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Title:
Viscosity index improver with high thickening power
Abstract:
Hydrogenated random block conjugated diene/monovinylarene copolymers with a terminal monovinylarene block having a diene content in the range of 44 to 70 weight percent, normalized vinyl in the range 30.2-51.3 percent, percent vinyl based on copolymer plus percent styrene in the range 59.8-71.5 percent, and molecular weight Mn in the range 94,000-199,000, used as viscosity index improver in lubricating oil, exhibits unusually high thickening power, yet provides viscosity index, pour point, and shear loss at very desirable levels.
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Other info:
Inventors:
Trepka, William J. (Bartlesville, OK)
Application Number:
06/331421
Filing Date: 1981-12-16
Publication_date: 1983-10-25
Assignee:
PHILLIPS PETROLEUM CO (US)
Primary Class(es):
585/12
252/32.7E, 252/51.5A
Other Classes:
C08C19/02; C08F8/04; C10M143/00; C08C19/00; C08F8/00; C10M1/18
US Patent Ref:
| 2798853 | July, 1957 | Young et al. | Lubricant containing hydrogenated liquid polymer oils | | | 2864809 | December, 1958 | Jones et al. | Hydrogenated polybutadiene and process for producing same | | | 2975160 | March, 1961 | Zelinski | Preparation of copolymers in the presence of an organo-lithium catalyst and a solvent mixture compri | | | 3333024 | July, 1967 | Haefele et al. | Block polymers, compositions containing them and process of their preparation | | | 3402159 | September, 1968 | Hsieh | Process for polymerizing butadiene and styrene terminated in short blocks of polystyrene | | | 3419365 | December, 1968 | Streets | Petroleum distillates containing butadiene-styrene copolymers | | | 3431323 | March, 1969 | Jones | HYDROGENATED BLOCK COPOLYMERS OF BUTADIENE AND A MONOVINYL ARYL HYDROCARBON | | | 3531450 | September, 1970 | Yoshimoto et al. | THREE COMPONENT HYDROGENATION CATALYSTS AND A PROCESS FOR HYDROGENATING POLYMERS BY THE USE OF THEM | | | 3547821 | December, 1970 | McCoy et al. | HYDROCARBON LUBRICATING OIL CONTAINING A POLYMER OF A CONJUGATED DIOLEFIN AS A VISCOSITY INDEX IMPRO | | | 3554911 | January, 1971 | Schiff et al. | | | | 3600311 | August, 1971 | Nakman et al. | | | | 3630905 | December, 1971 | Sorgo | | | | 3752767 | August, 1973 | Eckert | | | | 3761404 | September, 1973 | Calow et al. | | | | 3772169 | November, 1973 | Small et al. | OIL COMPOSITIONS | | | 3772196 | November, 1973 | St. Clair et al. | 252/32.7E | LUBRICATING COMPOSITIONS | | 3994815 | November, 1976 | Coleman | 252/52R | Additive concentrates and lubricating compositions containing these concentrates | | 4073738 | February, 1978 | Ladenberger et al. | Lubricating oil compositions containing alkyl acrylate or methacrylate polymers and copolymers of st | | | 4145298 | March, 1979 | Trepka | Hydrogenated lithiated copolymers grafted with organic nitrogen compounds as viscosity index improve | | | 4162985 | July, 1979 | Holubee | Multigrade lubricants containing interpolymers | |
Other Refs:
Other References:
Gruse et al., Chemical Technology of Petroleum (McGraw-Hill 1960), pp. 15, 16, 52, 53.
Primary Examiner:
Howard, Jacqueline V.
Assistant Examiner:
Attorney:
Burns, Doane, Swecker & Mathis
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